Iron Man 4: 5 Villains We Want To See
1. Fin Fang Foom
The reason I have Fin Fang Foom at number one may be purely selfish but I really want to see Marvel Studios attempt this. Fin Fang Foom, by all superficial accounts, is a dragon. He came to earth from his alien world of Kakaranathara, aka Maklu IV in the Maklu system of the Greater Magellanic Cloud, to conquer planets with the help of other members of his race.
After being awakened from a few years hiding in his lair he was found by the Mandarin, whose 10 rings of power were actually artifacts from Foom's spaceship. Awakening a well over 100 foot Fin Fang Foom, Mandarin used him to threaten the Chinese government. The Chinese called in Iron Man to confront them, but he was quickly defeated.
War Machine arrived to help, but at this point, the rest of Foom's crew decided to shed their mortal shells and revealed themselves to the world. Foom and nearly a dozen of his cohorts terrorized the Chinese before the Iron Man and War Machine along with the Mandarin - who realized the aliens were merely using him - combined the energies of Iron Man's armor and the Mandarin's rings into a small nuclear blast that was thought to have wiped out the dragons.
Fin Fang Foom presents a refreshing change of pace from the usual rich industrialists and armored villains that dominate Iron Mans Rogues Gallery.